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- W1163385807 abstract "The Striated Darter, Etheostoma (Catonotus) striatulum, is a rare percid whose known range is restricted to 15 streams in the mid-to-upper Duck River system, Tennessee. The last rangewide assessment of its conservation status occurred in 1992, a survey which yielded only 26 specimens. In June-July 2006 we reevaluated the darter’s population status and characterized its habitat by surveying 30 reaches in 22 streams. Striated Darters were detected in 11 of 30 reaches with a total of 102 individuals observed; 78 were young-of-year juveniles and 24 were adults. In late July total lengths ranged 19-31 mm (mean = 24 mm) for juveniles and 39-49 mm (mean = 43 mm) for adults, with only two age classes indicated. Several new occupied reaches were identified in streams where the darter had been collected previously; however, four historically occupied reaches, including the type locality, failed to produce specimens. At one of the better sites, a mark-recapture experiment revealed a population estimate of 136 Striated Darters per 100 m at a density of 0.14 individuals per m2. The 11 occupied reaches had the following mean characteristics: elevation 215 m above sea level, stream order 4.3, link magnitude 65, riparian zone width 11 m, wetted channel width 11 m, mid-channel depth 25 cm, discharge 0.01 m3/s, water temperature 26 C, pH 8.0, and conductivity 247 μS. On average, approximately one-fourth of the bottom surface of runs and pools was covered with broken slabrock substrate in the 11 occupied reaches. The number of individuals of other Catonotus species (E. flabellare, E. crossopterum and E. nigripinne) observed in occupied reaches was highly variable but averaged 53 individuals per reach. Environmental characteristics of occupied reaches were not significantly different from those of unoccupied reaches, at least for variables measured in this study. Our results highlight a species with limited distribution and abundance, a short lifespan, and whose status parallels that of other imperiled Catonotus species." @default.
- W1163385807 created "2016-06-24" @default.
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- W1163385807 date "2011-01-01" @default.
- W1163385807 modified "2023-09-23" @default.
- W1163385807 title "Population Status and Environmental Associations of the Rare Striated Darter, Etheostoma striatum" @default.
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